The Leaning Tower of Pisa is a famous freestanding bell tower located in the Italian city of Pisa. It is renowned for its unintended TILT, which began during construction in the 12th century and has become an iconic feature of the tower. The TILT is caused by an inadequate foundation on ground too soft on one side to properly support the structure's weight. The TILT is so pronounced that the top of the tower is displaced from the bottom by almost 4 meters. The feature of the Leaning Tower of Pisa is aptly described by the crossword solution 'TILT' (4 letters).